problem An issue with an underlying problem with the motherboard or with the fan?

[Memphills2]

So when I started my computer earlier it started to make a weird mechanical noise at the back of the case. I jump to see the rear fan making the commotion and that it seems to seen rather slower than usual. I first turn the computer off and on again and that fixed it. But, that's not good enough for me to just leave it. The PC is not, maybe good 2 years old. 

 

I assume that its one of the following that caused this:

1. The computer was having trouble with starting a fan. This would mean incorrect electric current delivery, which points to a big problem with the motherboard. Btw my motherboard is Asus Prime x470-pro.

 

2. Or the fan for some reason just didn't start correctly. Although I don't see why it would spin slower and not pick back up.

 

You tell me if you know. Thanks for replies in advance.

[SupaKomputa]

Clean it, give some lubrications on the motor (wd40 should do). Fan motor is a simple electric, it should last forever if maintained properly.